Sextant of Unstable Currents

• Sextant of Unstable Currents
• Item Level 128
  Disenchants into:
  [Void Crystal]: 1-2
• Binds when picked up
• Unique
• Trinket
• Requires level 70
• Equip: Improves critical strike rating by 40.
  Equip: Your spell critical strikes have a chance to increase your spell power by 190 for 15 sec.
• Sell Price: 9 11 60

Sextant of Unstable Currents is an epic trinket for DPS casters.

Source

This item drops from Fathom-Lord Karathress in Serpentshrine Cavern.

Notes

• There is an internal cooldown that prevents this trinket from proccing more than once every 45 seconds.
• The proc chance is 20%.

Effective Damage

The effective +damage granted by this trinket is achieved in a method almost identical to that of Shiffar's Nexus-Horn. Essentially, to get the most out of this trinket, you want shorter cast times, and higher crit.

The formula for calculating the amount of effective +damage granted by Sextant of Unstable Currents is -

E = 190 * 15 / (45 + (t / (0.2 * c)))

Where...

E = effective +damage
t = cast time
c = critical strike chance

The following Java Program can be used to obtain a table of effective +damage for different casting speeds:

   public static void main(String[] args)
   {
       float crit;
       float time;
       float effective;
       for(time = 1; time < 6.5f; time += 0.5f)
       {
           for(crit = 10; crit < 101; crit++)
           {
               effective = 190 * 15 / (45 + (time / (0.2f * (crit / 100))));

System.out.println("" + crit + "" + time + "" + effective + "");

           }
       }
   }

• 1.5s - Scorch, Searing Pain, Wrath

Base Crit %	Cast Time	Effective +Damage
20.0	1.5	34.545456
25.0	1.5	38.0
30.0	1.5	40.714287
35.0	1.5	42.903225
40.0	1.5	44.705883
45.0	1.5	46.216217
50.0	1.5	47.5

• 2.0s - Lightning Bolt

Base Crit %	Cast Time	Effective +Damage
20.0	2.0	30.0
25.0	2.0	33.52941
30.0	2.0	36.38298
35.0	2.0	38.737865
40.0	2.0	40.714287
45.0	2.0	42.396694
50.0	2.0	43.846153

• 2.5s - Frostbolt, Shadowbolt, Incinerate

Base Crit %	Cast Time	Effective +Damage
20.0	2.5	26.511627
25.0	2.5	30.0
30.0	2.5	32.884617
35.0	2.5	35.309734
40.0	2.5	37.37705
45.0	2.5	39.160305
50.0	2.5	40.714287

• 3.0s - Fireball

Base Crit %	Cast Time	Effective +Damage
20.0	3.0	23.750002
25.0	3.0	27.142857
30.0	3.0	30.0
35.0	3.0	32.439022
40.0	3.0	34.545456
45.0	3.0	36.382977
50.0	3.0	38.0

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB